Gastritis is an inflammation of the stomach lining that can be acute or chronic. Common symptoms include epigastric discomfort, abdominal bloating, vomiting, and nausea. Treatment involves medications to reduce stomach acid such as antacids, H2 blockers, and antibiotics if caused by H. pylori infection. Tests like upper endoscopy, blood tests, and stool tests can help diagnose gastritis. Lifestyle changes including a soft diet, fluids, rest, and avoiding irritants can help. Medications are also used to treat gastritis, including antibiotics, acid reducers, and antacids. Acute gastritis causes severe pain and comes on suddenly while chronic gastritis develops more slowly